Apparatus for oiling the cylinders and pistons in surfacing machines



v E. ISAACSON Afr/mums won 01mins THE CYLINDERS AND PISTONS m suamcmsmcumns Fild NEv. 10 1925 Patented Sept. 29, 1925.

.j UNlTED STATES EDWARD ISAAGSON, on ST. cLoUn, MINNESOTA.

PATENT OFFICE.

APPARATUS FOR OILIIiTG THE CYLINDER-s ANnrrs'roNs n sURrAoINe MACHINES;A

Application filed November 10, 1923. SerialNo. 674,018.

To all whom it may concern:

Be it known that I, EDWARD ISAACSO'N, a

citizen of the United States, residing at St. Cloud, in the county ofStearns and State of Minnesota, have invented certain new and usefulImprovements in Apparatus for Oilingthe Cylinders and Pistons inSurfacing Machines, of which the following is aspecification. r

' This invention relates to apparatus for oiling the cylinder and pistonin a surfacing machine and consists in the novel features andstepshereinafter described and claimed. A surfacing machine is one usedforraising and lowering large hammers at a rapid rate of speed and droppingthem upon the surface of rock which it is desired to smooth. Suchmachines are used in granite and marble building and monument work forthe purpose of getting the stone in a presentable and marketable shape.The machine is run by compressed air which is forced into a cylinder andallowed to escape at short intervals. As the air enters the cylinder itforces the piston which holds the hammer, in a downward direction.Considerable difficulty has been encountered in properly lubricating thecylinder and piston. Many machines have no oilers at all and otherssimply pour oil into a cylinder in large quantities which only lasts fora few minutes and disappears around the piston and escapes through theexhaust.

With this object in view the invention consists of a chamber adapted toretain the oil and which is fitted in the top of the cylinder. Thechamber is provided at its top with an opening which is normally closedby a removable plug. A spider is located interiorly of the chamber and aneedle valve is screwed therein. A coil spring is interposed between thespider and the head of the needle valve and serves to hold the valve atan adjusted position. At its lower end the chamber is provided with anoil outlet opening which is located opposite the pointed end of theneedle valve. The air inlet and exhaust pipes communicate with. thechamber at points above the spider. A nipple is connected with the lowerend of the chamber and is also connected with the cylinder of thesurfacing machine hammer. A movable ball is retained in the nipple andnormally rests upon an inturned seat provided at the lower end thereofand closes the passageway through the nipple. As the air enters thecylinder the ball is lifted from its seat and the oil drops intothecylinder and is administered to the parts. 'When; the air pressure isinterrupted the ball falls to the seat and the flow of oil iscut off. ii

In the accompanying drawings- Figure 1 is a vertical sectional view ofiamachine hammer with the. oiling chamber attached.

Figure 2 is an enlarged sectional view" of the oilchamber detached.

Figure 3 is a transverse sectionalview of thesame.

' Figure 4 is a plan view of the nipple. The machine to which the oilingsystem is applied comprises a cylinder 1' which-is mounted in a suitableframe 2." A piston 3 is slidably mounted in the cylinder ina usualmanner. Amair pipe 4 connects with the upper part of the cylinderand anexhaust pipe 5 also connects with the upper part of the cylinder in ausual manner.

A nipple 6 is screwed in the top of the cylinder and is provided at itslower end with an inturned valve seat 7. A ball 8 is retained in thenipple and normally rests by gravity upon the seat 7 A cross bar 9extends across the interior of the nipple at the upper portion thereofand serves to prevent the ball from passing out of the top of the nipplewhen the air pressure is on in the cylinder as will be hereinafterexplained. A chamber or casing 10 is screwed upon the upper end of thenipple and is provided at its lower end with a reduced outlet opening 11which is centrally disposed with relation to the nipple. A spider 12 isdisposed transversely across the intermediate portion of the chamber andcarries at its center an internally threaded annulus 13. A needle valveor pin 14 is provided between its ends with an enlarged portion 15 whichis screw threaded in the annulus 13. The needle valve 14; is provided atits upper end with a head 17 which in turn is provided with a screwdriver groove 17. A coil spring 18 is interposed between the spider andthe head 16 of the needle valve and serves to hold the needle valve atan adjusted position with relation to the oil outlet opening 11 at thebottom of the chamber and after the valve has been set. The spring 18 isof general cone shape configuration in side elevation so that the coilsthereof may nest within each other when the spring is compressed.

The chamber 10 is provided at its top with an opening 20 which isnormally closed by a detachable plug 21, there being a leather washer 22interposed between the head of the plug and the top of the chamber, in ausual manner. The plug is provided with a transversely disposed opening23 through which a nail or other object may be passed when it is desiredto turn the plug.

The operation of the device is as follows. The air under pressure entersthe cylinder 1 through the pipe 4 and operates the piston 3 in thecylinder in a usual manner. At the same time the air pressure lifts theball 8 from the seat and the oil, which is contained in the chamber andnipple, passes around the ball 8 and drops into the cylinder and uponthe piston and lubricates the parts. When the air pressure isinterrupted the ball 8 falls by gravity to the seat 7 and closes thepassageway of the oil-through the nipple and hence the passing of theoil from the chamber and nipple to the interior of the cylinder isautomatically interrupted.

By removing the plug 22 from the chamber, the end of a screw driver, notshown,

may be inserted in the groove 17 of the head 18-of the needle valve andthe said valve may be adjusted so that its lower pointed end is disposedat a proper distance from the opening 11 and hence the quantity of theoil which flows from the chamber into the nipple may be regulated asrequired to effect the desired results in an economical manner.

Having described the invention what is claimed is 1 An oiler comprisinga substantially elliptical chamberprovided at one end with a socket andat its opposite end with an opening, a plug closin'g'saidopening, anipple screwed in the socket and having a seat and a cross bar spacedfrom the seat, a ball carried in the nipple between the seat and thecross bar, the end portion of the chamber having a needle valve seatwhich enters the socket, a spider located in the chamber, and a needlevalve extending through and having a screw threaded engagement with thespider.

In testimony whereof I afiix my signature.

EDWARD ISAACSON.

